just monday, I spent 4 wonderful hours to go from CDG into town because public transport in Paris is simply broken. Berlin isn't 100% but it's 100% better.
I'm not talking about connectivity inside the town. But yes, there are some problems (eventually)
Or you could just take a cab from CDG to Paris.
But Paris has the Eurostar and Thales this means 1h15 from Paris (city center) to Brussels (city center) and +/- 2h20 to London (St Pancras station). Without having to go to a far-away airport and get there 1h before the flight.
Berlin sure has lots of flights but it's not an Intl hub like LHR or CDG
Let me add (compared to Berlin):
Good connectivity to: London, Brussels (train) and other cities (CDG one of the biggest air hubs)
Major companies are there: http://en.wikipedia.org/wiki/Economy_of_Paris#Fortune_Global...
(Most of the big companies are there: fashion, banks, defense/big contractors (some), etc)